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PHILADELPHIA (CBS) — A 41-year-old man has pleaded guilty to first-degree murder in an horrific 2007 attack on the family of a former girlfriend following a bad break-up.

Philadelphia prosecutor Jacqueline Coelho says defendant Cam Tran broke into the Olney home of his former girlfriend, who had moved out of state to get away from him, and waited.

“When her sister, who was 17 at the time, came home, he tied her to the bed and raped her,” Coelho says. “He then waited for the mother to come home and he stabbed her repeatedly.”

Tran killed the mother and then set the house on fire with the sister still tied to the bed.

She suffered severe burns, but was eventually able to get free and jump from a window of the burning home.

“She jumped from the second floor down into the driveway area,” Coelho tells KYW Newsradio. “Her skin was coming off. She had duct tape around her face. She immediately told police it was her sister’s ex-boyfriend and identified the defendant.”

In addition to other injuries, Coelho says the teen’s hand had to be amputed because of her burns.